基本事件包括begin,canceled,move,ended四项,如果对象的hidden属性为yes,则无效果,hidden属性必须为no;才能使用:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{//触碰开始
// NSLog(@"%ld",[touches count]);
if ([[event allTouches]count]==2) {
NSArray * one =[[event allTouches]allObjects];
_tiLabel.hidden=NO;
_yLabel.hidden=NO;
_tiLabel.center=[[one objectAtIndex:0] locationInView:self.view];
_yLabel.center=[[one objectAtIndex:1] locationInView:self.view];
}
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{//触控发生意外终止是
_tiLabel.hidden=YES;_yLabel.hidden=YES;
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{//触控结束时
_tiLabel.hidden=YES;_yLabel.hidden=YES;
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event//触控移动时
{
// NSLog(@"%ld",[[event allTouches]count]);
if ([[event allTouches]count]==2) {
NSArray * one =[[event allTouches] allObjects];
_tiLabel.hidden=NO;
_yLabel.hidden=NO;
_tiLabel.center=[[one objectAtIndex:0] locationInView:self.view];
_yLabel.center=[[one objectAtIndex:1] locationInView:self.view];
}
}
下面是六大常用事件,包括:点击,拖动,捏合,旋转,长按以及轻扫
点击事件:顾名思义(UITapGestureRecognizer)
拖动事件:拖动view内的对象(UIPanGestureRecognizer)
捏合事件:主要用于操作对象的方法以及缩小(UIPinchGestureRecognizer)
旋转事件:主要用于控制对象的旋转角度(UIRotationGestureRecognizer)
长按事件:顾名思义(UILongPressGestureRecognizer)
清扫事件:主要add在view内,轻扫又可以按照属性分为上下左右四向的清扫(UISwipeGestureRecognizer)
想对某个对象添加六大事件,对象的userinteractionEnable属性必须为yes;否则六大事件会无响应:
- (void)viewDidLoad {
[super viewDidLoad];
UIImage * pic =[UIImage imageNamed:@"rmb.jpg"];
UIImageView * imgView = [[UIImageView alloc]initWithImage:pic];
imgView . backgroundColor = [UIColor blackColor];
imgView.frame =CGRectMake(0, 0, 300, 200);
imgView . userInteractionEnabled=YES;/**********该项设置必须为yes************/
[self.view addSubview:imgView];//imageview对象的代码创建
/*------------------------下面是事件对象的创建以及add操作---------------------*/
//点击
UITapGestureRecognizer * tapGestureRecognizer=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
tapGestureRecognizer.numberOfTapsRequired=1;
tapGestureRecognizer.numberOfTouchesRequired=1;
//设置点击事件的单击次数以及手指个数
[imgView addGestureRecognizer:tapGestureRecognizer];
//拖动
UIPanGestureRecognizer * panGestureRecognizer=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
[imgView addGestureRecognizer:panGestureRecognizer];
//旋转
UIRotationGestureRecognizer * rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotation:)];
[imgView addGestureRecognizer:rotationGestureRecognizer];
//捏合
UIPinchGestureRecognizer * pinchGestureRecognizer= [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)];
[imgView addGestureRecognizer:pinchGestureRecognizer];
//长按
UILongPressGestureRecognizer * longGestureRecognizer = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLong:)];
[imgView addGestureRecognizer:longGestureRecognizer];
//清扫
UISwipeGestureRecognizer * leftGestureRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipe:)];
leftGestureRecognizer.direction=UISwipeGestureRecognizerDirectionLeft;//设置清扫的方向
UISwipeGestureRecognizer * rightGestureRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipe:)];
rightGestureRecognizer.direction=UISwipeGestureRecognizerDirectionRight;//设置清扫的方向
[self.view addGestureRecognizer:leftGestureRecognizer];
[self.view addGestureRecognizer:rightGestureRecognizer];
}
-(void)handleTap:(UITapGestureRecognizer * )recognizer {
// NSLog(@"向左清扫");
[[[UIAlertView alloc]initWithTitle:@"提示" message:@"点击事件发生" delegate:self cancelButtonTitle:nil otherButtonTitles:@"ok",nil] show];
}//点击处理
-(void)handlePan:(UIPanGestureRecognizer *) recognizer{
UIImageView * current=(UIImageView *)recognizer.view;//获取imageview对象
CGPoint translaation=[recognizer translationInView:recognizer.view];//获得移动的坐标
current.center=CGPointMake(current.center.x+translaation.x, current.center.y+translaation.y);
//使用原先坐标加上移动后的坐标,赋值给imageview对象
[recognizer setTranslation:CGPointZero inView:self.view];
//清零,防止再次移动
}//拖动处理
-(void)handleRotation:(UIRotationGestureRecognizer *) recognizer{
recognizer . view . transform=CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
}//旋转处理
-(void) handlePinch:(UIPinchGestureRecognizer *) recognizer{
recognizer . view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
recognizer.scale=1;
}//捏合处理
-(void) handleSwipe:(UISwipeGestureRecognizer *) recognizer{
if (recognizer.direction==UISwipeGestureRecognizerDirectionRight) {
NSLog(@"向右清扫");
}else if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft){
NSLog(@"向左清扫");
}
}//清扫处理
-(void) handleLong:(UILongPressGestureRecognizer *) recognizer{
NSLog(@"长按事件");
}//长按处理